Unable to pair Fenix7 phone with Garmin Connect on iPhone

Tis is probably not the right forum, but anyway, here's my problem. 

It has been working fine for a couple of years, but I am now unable to pair my Fenix 7 with Garmin Connect on my iPhone. Connect hangs at "Pairing Your fenix 7 Device"

Stepping through the process:

On the Fenix 7: 

Settings->connectivity-> Phone->Status Waiting for phone

On the iPhone:

Garmin Connect ->...More->Garmin Devices->Add Device->Browse all compatible devices->Fenix->fenix-.> Hangs at Pairing Your fenix 7 Device

Software version 21.19

CIQ 5.1.1

BMX:20.6.0

WHR: 20.06.00

iPhone:

Removed and re-installed Garmin Connect.

Enabled bluetooth

Restarted the phone

restarted Garmin Connect

I have tried on my iPhone 11 Pro and my wife's iPhone X with the same result:

Watch 

I have restarted the watch after a factory reset.

The only discrepancy I can detect is that Garmin Connect Troubleshooting->"Show me how to pair" displays a slightly different screen sequence shows 

Connectivity->Pair Phone-> Connect logo

Fenix 7 shows 

Connectivity-> Phone-> Status Waiting for Phone as shown in the following images:

I haven't done this for a while so am not familiar with the process.

Any suggestion will be gratefully received.